Double Autohinting?

This is a general question for typefaces developed in FontLab and generated in OTF, TTF and maybe TT format: Since, unless there's someones who does it for me, I generally did not need accurate hinting, I never went into it. So I was wondering: since my drawings are always in Type1, and so my automatic hinting (which in FL stinks a bit, anyway), do I need to autohint for the TT environment as well?

Do the two instruction sets exclude each other mutually or are they kept both (I suspect so)?